linux-kernel - Re: [PATCH followup] mm: get rid of CONFIG_STACK_GROWSUP || CONFIG

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Message-Id: <20110420160946.4629.A69D9226@jp.fujitsu.com>
Date:	Wed, 20 Apr 2011 16:08:51 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH followup] mm: get rid of CONFIG_STACK_GROWSUP || CONFIG_IA64

> Hi Kosaki,
> 
> On Wed 20-04-11 09:33:26, KOSAKI Motohiro wrote:
> > > While I am in the cleanup mode. We should use VM_GROWSUP rather than
> > > tricky CONFIG_STACK_GROWSUP||CONFIG_IA64.
> > > 
> > > What do you think?
> > 
> > Now, VM_GROWSUP share the same value with VM_NOHUGEPAGE.
> > (this trick use the fact that thp don't support any stack growup architecture)
> 
> I am not sure I understand you. AFAICS, VM_GROWSUP is defined to non 0
> only if CONFIG_STACK_GROWSUP||CONFIG_IA64 (include/linux/mm.h).
> And we use it to determine whether expand_stack_growsup[*] should be
> defined (in include/linux/mm.h).
> 
> The patch basically unifies the way how we export expand_stack_growsup
> function and how define it (in mm/mmap.c).
> 
> So either we should use CONFIG_STACK_GROWSUP||CONFIG_IA64 at both places
> or we should use VM_GROWSUP trick. I am for the later one.
> 
> Am I missing something?
> 
> --- 
> [*] the previous patch renamed expand_growsup to expand_stack_growsup.

Right you are. sorry.



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